Rotary pump



" (No Model.)

F. S. TROUTMAN.

.- ROTARY PUMP. No. 295.597;

' Patentgd Mar. 25, 1884.

' WITNESSES .11 ttorneyts N. PETERS. Phavumc m hur, wdkhiuglflm D-C.

UNITED STATES PATENT QFFICET FRANK S. TBOUTMAN, OF SENECA FALLS, NEW/VYORK.

ROTARY PUMP.

SPECIFICATION forming part of Letters Patent No. 295,597, dated March 251884.

Application filed March 21, 1883. (No model.)

3T0 aZZ whom it may concern:

Be it known that I, FRANK S. TROUTMAN, a citizen of the United States ofAmerica, residing at Seneca Falls, in the county of Seneca and 5 Stateof New York, have invented certain new and useful Improvements in RotaryPumps; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same. T

This invention has relation to double-wheel rotary pumps 5 and theobject is to increase the efficiency, durability, and power of pumps ofthis kind.

Heretofore the use of double-wheel rotary pumps having pistons withblades all of one length and sweeping the casing with their sides andends has been attended with a great deal of wear of the operative parts,whichin a great measure is incident to the formation of a water-tightvchamber between the sides of r the casing and the blades of the pistonwhich contact during the operation of the pump. The water restrained andconfined in this chamber gives great resistance to the progress of thepistons and naturally is forced out through any interstice between theparts. The result is that the blades or casing, or both, are speedilyworn to such an extent that the pump is rendered almost useless, or atleast is greatly impaired in efficiency. The purpose of my improvementis to avoid this defective construction and to prevent the resultantdamage to the machine. I attain these objects and purposes of myimprovements by constructing the blades of the pistons plane andstraight on one side, and convex or concave, or of irregular contour, onthe other or contact side, and in so disposing the pistons in the casingrelatively to each other that when water-tight chambers are formedbetween two pairs of contactingblades said chambers shall not bediminished in capacity at any time during the progress of the pistons.This is accomplished, as stated, by forming the blades plane andstraighton one side, andconvex or concave or irregular 011 the other side, andthen placing the pistons in the casing so that the irregular surfacesshall be the contact-surfaces, thus leaving the intermediate chamber tobe formed between the blades.

In the accompanying drawings, illustrating my improvements, Figure 1 isa perspective View of the pistons applied to a casing witha pump-stock.Fig. 2 isa side view, showing pump stock, the former of which is of theusual elliptical form, and is provided with induction and'dischargeorifices, substantially as shown in the drawings in Fig. 1. On one sideI) the casing is cast or made as part of the chamber, and the other side(not shown) is removable, and secured to the casing by screw-bolts, theunion of the parts/being made tight by packing.

The letter B represents the pistons having journals a a fitted to andworking in bearings formed in the side plates of the case. The j ournalof one of the pistons is extended and passes through the side of thecase, and to this extended journal the power is applied or connected. Inthe drawings, Fig. 1, I have shown fixed to this extended journal abalance-wheel with a hand-grasp; but any other means giving therequisite power may be applied; and as the power revolves the piston towhich it is applied, the blades of that piston engage with those of theother piston, and necessarily turn that. The blades 0 of the pistons areformed plane and straight on one side, (1, and on the other side madeslightly convex or of any suitable irregular contour, substantially asseen in the drawings. The blades are of such length that there shall notbe contact of their ends,

with the body of the journal between the blades of the opposite piston,in order that the frictional contact shall not be effected at theseparts, and in order also that the contact-surface of the blades shall belessened. The sides and ends of the pistons fit close to the sides anddrums of the case, so that the water carried by the blades can find nodischarge, except as provided for. The pistons are placed in the easingwith the plane surfaces of the power-piston in-reverse of the directionof the motion, and the plane surface of the other piston set to thedirection of its motion, the blades, as stated, falling short of thebase of the opposite one, substantially as seen in the drawings. Thisplane surfaces of two 1 construction and disposition bring the irregu- 7llar surfaces of the piston-blades in primary contact at the upperportion, as usual, from which point progression is made until the nextblades meet, at which moment a water-tight chamber, D, is formed betweenthe base of the arms, their flat faces, and the sides of thecasing,which chamber, from the time of its formation, is not reduced orcompressedin size; but, on the contrary,while two approaching blades arein progressive contact, or increasing their lap, the two precedingcontacting blades are in retrogressive contact, or decreasing their lap;but no two blades at any time lap each other their full length, theeiiect being that the water-tight chamber is never diminished in ca- I 5pacity, and therefore no power is wasted in overcoming a resistance ofthe water to compression in such chamber.

The evidences of the existence of such a watertight chamber in pumps ofordinary construction consist in the chuckin or thum ing heard duringthe operation of thepunip, but in pumps of my construction the operationis devoid of such evidences.

lVhat I claim as my invention, and desire to secure by Letters Patent,is

In a double-piston rotary pump, the combination, with the casing, asdescribed, of the pistons 13, having blades 0, the contact-surfaces ofwhich are curved and their opposite surfaces flat, said pistons being sorelatively arranged that at the time progressive contact FRANK S.TROUTMAN.

\Vitnesses:

JAsrnR N. HAMMOND,

HENRY LIENHART.

